100% Polyester Made in the USA or Imported SBDs 3” Round PYRAMID Black Light Pole Top Caps |Glass-Reinforced Polyester | Snap on Plugs for Fencing, Flag Poles, Goal Posts, Mail Box | Made in USA These self-locking utility pole caps are made from a tough glass-filled polyester, which is a durable material designed to withstand aging and weathering in an exposed hostile environment. They are black in color to withstand the sun's ultraviolet rays. These Caps work equally well in straight or tapered poles and will prevent dust, water, and other debris from entering the pole and causing damage. These caps are designed for easy installation with no tools required. They snap into the pole using specially designed clips to lock it into place.